Boring attachment for lathes



(No Model.)

J. WALKER. I BORING ATTACHMENT FOR LATHES.

No. 451,092. Patented Apr. 28, 1891.

INVENTD R WITNESSES PATENT FFICE.

JOHN VALKER, OF CLEVELAND, OHIO.

BORING ATTACHMENT FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 451,092, dated April 28, 1891. Application filed January 81,1891. Serial No, 379,842. (No model.)

To aZZ whom ifi'may concern;

Be it known that I, JOHN WALKER, a citizen of the United States, residing at Cleveland, in he county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Boring Attachments forLathes, of which the following is afull, clear, and exact description, reference being had to the accompanying drawings, in which Figure 1 is a side elevation of a part of the lathe, showing my attachment applied thereto. Fig. 2 is a top plan view of the same, and Fig. 3 is an end view of the boring-bar and its bearing on one of the standards.

My invention relates to the class of devices adapted to be attached to lathes for the pur- .pose of adding to their capabilities and facilitating the proper performance of certain special work.

Myinvention is an attachment applicable to a lathe of any standard construction, whereby the lathe is adapted to be used as a horizontal boring-mill for boring and finishing pulley-hubs and other thick work.

Among the advantages attained by my invention are simplicity of construction, ease of connecting the attachment with a lathe, and especially the prevention of the springing of the boring-bar and consequent chattering of the tool or unevenness of the out.

My invention consists of the combination of a standard adapted to be attached to the slide-rest, a standard adapted to be attached to the bed behind the slide-rest, each standard having a bearin g for the boring-bar, with a boring-bar having a fixed longitudinal key, which lies in slots in the two bearings, and means for rigidly securing the boring-bar to the forward standard.

It also consists in the subordinate combination of parts hereinafter described, and pointed out in the claims.

Referring now to the drawings, A represents the bed, and B the slide-rest, of an ordinary lathe.

0 represents a standard extending trans- I versely of the bed and secured by bolts to the slide-rest behind the tool-holder. The upper surface of this standard is provided with T- grooves, and a pillow-block D, having tongues fitted to said grooves, is mounted on the top of said standard.

The pillow-block may thus on its under side, whereby it is adapted to rest on the shears of the lathe behind the sliderest. It is secured at any desired point by bolt 6. transverse T-grooves, in which are fitted tongues on the under side of the pillow-block F, and this block is fastened at any desired point to the standard by the bolts ff. This pillow-block and its cap F form the bearings through which the boring-bar-is adapted to slide freely.

G represents a boring-bar, which passes between the parts F F, above referred to, and lies in a bearing in the block 'D. The capplate D is fastened in the block D by bolts. whereby said cap-plate is drawn down upon the bar. which is thus clamped firmly between it and the pillow-block. A fixed longitudinal key or feather g on the bar G fits into corresponding grooves in the pillow-blocks D and F, whereby the rotation of the bar is prevented,while its longitudinal movement in the bearings attached to the rear standard is unimpeded.

In boring a hub of a pulley, for example, it is strapped or bolted to the faceplate. The boring-tool is fastened to the boring-bar G directly or to a tapered mandrel, which maybe secured in a tapered socket into the end of the boring-bar. The work rotates and the boring-bar is moved forward by the movement of the slide-rest. The rear standard remains stationary, but supports the rearend of the boring-bar, and this prevents almost entirely any springing of the bar and consequent chattering of the tool or unevenness in the cut. The location of the standard 0 behind the tool-holder of the slide-rest makes it possible to turn and finish the outside of the hub while its center is being bored out.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

Its upper surface is provided with 1. The combination of a standard adapted to be attachedto a slide-rest of alathe, a standard adapted to be attached to the bed behind the slide-rest, each standard having a with a boring-bar having a fixed longitudinal key which lies in slot-s in said pillow-blocks, and cap-plates and bolts adapted to clamp said boring-bar to the forward pillow-block 15 and to hold it loosely in the rear block, substantially as and for the purpose specified.

JOHN WALKER. Witnesses:

ALBERT H. BATES, E. L. THURSTON. 

